{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74574", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.917Z", "datePublished": "2026-08-15T12:28:12.558Z", "dateUpdated": "2026-08-17T05:48:53.873Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:48:53.873Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()\n\nThe failed_dev_add and failed_dev_name paths drop the file-device\nreference while wq->wq_lock is still held. If put_device(fdev) drops the\nlast reference, idxd_file_dev_release() runs synchronously and tries to\ntake wq->wq_lock again, deadlocking.\n\nThose paths also fall through into the later ctx cleanup labels even\nthough idxd_file_dev_release() owns that cleanup and frees ctx. This can\nmake idxd_xa_pasid_remove(ctx) and kfree(ctx) operate on a freed context.\n\nMove idxd_wq_get() before file-device setup can fail, since the release\ncallback always calls idxd_wq_put(). Then unlock wq->wq_lock before\nput_device(fdev) and return directly from the file-device setup failure\npath, leaving ctx cleanup to the release callback."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The flaw is reached only through the local open() syscall on an Intel DSA/IDXD user workqueue character device (/dev/dsa/wq* or /dev/iax/wq*); idxd_cdev_open() is the cdev .open handler and is not reachable from any network-facing kernel service.\nAC:L - An attacker who can open the cdev can reliably hit the failed_dev_name/failed_dev_add cleanup by inducing GFP_KERNEL allocation failures (e.g., memory pressure) during device setup; no race or victim-controlled state beyond that is required.\nPR:L - Exploitation requires only local permission to open the configured user-type DSA workqueue cdev, which on DSA-equipped servers is commonly granted to unprivileged workload/service accounts via udev group ACLs after one-time admin WQ setup, not init-namespace root.\nUI:N - The attacker triggers the bug by opening the character device themselves; no additional end-user or administrator interaction is required at exploitation time beyond prior WQ enablement.\nS:U - The deadlock, use-after-free, and double-free corrupt kernel/IDXD driver heap state and block the affected workqueue; impact does not cross VM, IOMMU/DMA, or other security boundaries into a separate authority.\nC:H - On the error path put_device() synchronously runs idxd_file_dev_release(), which kfree()s ctx while idxd_cdev_open() still references it via filp->private_data, and the fall-through path can call idxd_xa_pasid_remove()/kfree() again\u2014classic kernel heap UAF enabling memory disclosure.\nI:H - Double-free and use-after-free of the kmalloc-backed idxd_user_context can corrupt slab metadata and be developed into arbitrary kernel memory writes and privilege escalation, not merely a controlled error return.\nA:H - Calling put_device() while holding wq->wq_lock deadlocks when idxd_file_dev_release() re-acquires that mutex, hanging the opener and blocking all other users of the workqueue; heap corruption can additionally panic the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/dma/idxd/cdev.c"], "versions": [{"version": "e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec", "lessThan": "778ccbded2c8749c5be7f0dfa04fc9977a36fb7e", "status": "affected", "versionType": "git"}, {"version": "e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec", "lessThan": "8d5d28285728be47c82fdf1c48be4268293c90e7", "status": "affected", "versionType": "git"}, {"version": "e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec", "lessThan": "0679c0c189d2548f00e1bac95be28e2df5c6c7f7", "status": "affected", "versionType": "git"}, {"version": "e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec", "lessThan": "6e26a41c4c1a706edaaa7c7dffc6b3b945707a55", "status": "affected", "versionType": "git"}, {"version": "e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec", "lessThan": "ee1d7274102285d78a53161fc705a8d8cd40b066", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/dma/idxd/cdev.c"], "versions": [{"version": "6.4", "status": "affected"}, {"version": "0", "lessThan": "6.4", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.151", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.6.151"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.12.103"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.18.44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "7.1.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/778ccbded2c8749c5be7f0dfa04fc9977a36fb7e"}, {"url": "https://git.kernel.org/stable/c/8d5d28285728be47c82fdf1c48be4268293c90e7"}, {"url": "https://git.kernel.org/stable/c/0679c0c189d2548f00e1bac95be28e2df5c6c7f7"}, {"url": "https://git.kernel.org/stable/c/6e26a41c4c1a706edaaa7c7dffc6b3b945707a55"}, {"url": "https://git.kernel.org/stable/c/ee1d7274102285d78a53161fc705a8d8cd40b066"}], "title": "dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/dma/idxd/cdev.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "778ccbded2c8749c5be7f0dfa04fc9977a36fb7e", "status": "affected", "version": "e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec", "versionType": "git"}, {"lessThan": "8d5d28285728be47c82fdf1c48be4268293c90e7", "status": "affected", "version": "e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec", "versionType": "git"}, {"lessThan": "0679c0c189d2548f00e1bac95be28e2df5c6c7f7", "status": "affected", "version": "e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec", "versionType": "git"}, {"lessThan": "6e26a41c4c1a706edaaa7c7dffc6b3b945707a55", "status": "affected", "version": "e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec", "versionType": "git"}, {"lessThan": "ee1d7274102285d78a53161fc705a8d8cd40b066", "status": "affected", "version": "e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/dma/idxd/cdev.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.4"}, {"lessThan": "6.4", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.151", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.103", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.44", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()\n\nThe failed_dev_add and failed_dev_name paths drop the file-device\nreference while wq->wq_lock is still held. If put_device(fdev) drops the\nlast reference, idxd_file_dev_release() runs synchronously and tries to\ntake wq->wq_lock again, deadlocking.\n\nThose paths also fall through into the later ctx cleanup labels even\nthough idxd_file_dev_release() owns that cleanup and frees ctx. This can\nmake idxd_xa_pasid_remove(ctx) and kfree(ctx) operate on a freed context.\n\nMove idxd_wq_get() before file-device setup can fail, since the release\ncallback always calls idxd_wq_put(). Then unlock wq->wq_lock before\nput_device(fdev) and return directly from the file-device setup failure\npath, leaving ctx cleanup to the release callback."}], "id": "CVE-2026-74574", "lastModified": "2026-08-17T06:19:55.750", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T13:18:03.063", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0679c0c189d2548f00e1bac95be28e2df5c6c7f7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6e26a41c4c1a706edaaa7c7dffc6b3b945707a55"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/778ccbded2c8749c5be7f0dfa04fc9977a36fb7e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8d5d28285728be47c82fdf1c48be4268293c90e7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ee1d7274102285d78a53161fc705a8d8cd40b066"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()", "id": "2516974", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516974"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-833", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()\nThe failed_dev_add and failed_dev_name paths drop the file-device\nreference while wq->wq_lock is still held. If put_device(fdev) drops the\nlast reference, idxd_file_dev_release() runs synchronously and tries to\ntake wq->wq_lock again, deadlocking.\nThose paths also fall through into the later ctx cleanup labels even\nthough idxd_file_dev_release() owns that cleanup and frees ctx. This can\nmake idxd_xa_pasid_remove(ctx) and kfree(ctx) operate on a freed context.\nMove idxd_wq_get() before file-device setup can fail, since the release\ncallback always calls idxd_wq_put(). Then unlock wq->wq_lock before\nput_device(fdev) and return directly from the file-device setup failure\npath, leaving ctx cleanup to the release callback.", "A flaw was found in the Linux kernel's dmaengine IDXD subsystem. A race condition during file-device setup failure cleanup in the idxd_cdev_open() function could lead to a deadlock, causing a denial of service. Furthermore, incorrect cleanup paths could result in operations on a freed memory context, potentially allowing a local attacker to escalate privileges."], "name": "CVE-2026-74574", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74574\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74574\nhttps://lore.kernel.org/linux-cve-announce/2026081555-CVE-2026-74574-9259@gregkh/T"], "threat_severity": "Important"}